Truncate labels longer than 63 chars

Signed-off-by: Olaf Lessenich <olessenich@eclipsesource.com>

Author: xai

java/common/org.eclipse.theia.cloud.common/src/main/java/org/eclipse/theia/cloud/common/util/LabelsUtil.java

@@ -2,11 +2,14 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.logging.Logger;
 
 import org.eclipse.theia.cloud.common.k8s.resource.appdefinition.AppDefinitionSpec;
 import org.eclipse.theia.cloud.common.k8s.resource.session.SessionSpec;
 
 public class LabelsUtil {
+    private static final Logger LOGGER = Logger.getLogger(LabelsUtil.class.getName());
+
     public static final String LABEL_CUSTOM_PREFIX = "theia-cloud.io";
 
     public static final String LABEL_KEY_SESSION = "app.kubernetes.io/component";
@@ -18,14 +21,24 @@ public class LabelsUtil {
     public static final String LABEL_KEY_USER = LABEL_CUSTOM_PREFIX + "/user";
     public static final String LABEL_KEY_APPDEF = LABEL_CUSTOM_PREFIX + "/app-definition";
 
+    private static final int MAX_LABEL_LENGTH = 63;
+
+    private static String truncateLabelValue(String value) {
+        if (value.length() > MAX_LABEL_LENGTH) {
+            LOGGER.warning("Label value truncated: " + value);
+            return value.substring(0, MAX_LABEL_LENGTH);
+        }
+        return value;
+    }
+
     public static Map<String, String> createSessionLabels(SessionSpec sessionSpec,
             AppDefinitionSpec appDefinitionSpec) {
         Map<String, String> labels = new HashMap<>();
         labels.put(LABEL_KEY_SESSION, LABEL_VALUE_SESSION);
         labels.put(LABEL_KEY_THEIACLOUD, LABEL_VALUE_THEIACLOUD);
         String sanitizedUser = sessionSpec.getUser().replaceAll("@", "_at_").replaceAll("[^a-zA-Z0-9]", "_");
-        labels.put(LABEL_KEY_USER, sanitizedUser);
-        labels.put(LABEL_KEY_APPDEF, appDefinitionSpec.getName());
+        labels.put(LABEL_KEY_USER, truncateLabelValue(sanitizedUser));
+        labels.put(LABEL_KEY_APPDEF, truncateLabelValue(appDefinitionSpec.getName()));
         return labels;
     }
 }